PROM - MIL ON/False Code 43
Bulletin 87-6E-10Date Feb. '87
Ret. No. 87-077-6E
Corp. Ref. No. 736505
SUBJECT: FALSE CODE 43
MODELS AFFECTED: 1987 CENTURYS WITH LB6 2.8L MPFI V6 ENGINE (VIN CODE W)
Some 1987 Centurys equipped with the LB6 2.8L MPFI V6 engine (VIN Code W) may set a false code 43. The false code will be set under a deep, part throttle acceleration between 3400 and 4400 engine rpm. The "Service Engine Soon" light will come on and generally stay on until the ignition is turned off. A code 43 will be stored.
If normal diagnostic procedures, as found in the 1987 Buick Chassis Service Manual, Section 6E3, (for faulty knock sensor, "intermittents", faulty connections, or open or shorted wiring) don't correct the problem, a new Mem-Cal must be installed as per the following chart:
EMISSION MEM-CAL
MODEL TRANS. TRANSAXLE CALIBRATION PART NUMBERS
Coupe/Sedan Auto-3 2.84 Federal 16072936
Coupe/Sedan Auto-3 3.18 Federal 16072957
Coupe/Sedan Auto-4 3.33 Federal 16072977
Coupe/Sedan Auto-3 2.84 California 16072946
Coupe/Sedan Auto-3 3.18 California 16072967
Coupe/Sedan Auto-4 3.33 California 16072987
Wagon Auto-3 3.18 Federal 16073007
Auto-4 3.33 Federal 16073027
Wagon Auto-3 3.18 California 16073017
Auto-4 3.33 California 16073135
WARRANTY INFORMATION
Labor Operation Number: J6364
Labor Time: 0.7 Hrs.
Trouble Code: 92